基于QSSE方法的橡胶隔震支座参数识别

采用二次误差平方和(Quadratic sum-squares error,QSSE)方法对橡胶隔震支座参数识别进行研究。建立经典Bouc-Wen模型以模拟橡胶隔震支座的非线性动力学特性。对橡胶隔震支座进行振动台实验,基于实验测量的加速度响应和QSSE方法在线实时地识别橡胶隔震支座的参数和位移。研究结果表明,在两种典型地震波的激励作用下,采用QSSE方法分别对3种参数数量不同的Bouc-Wen模型进行识别,得到的橡胶隔震支座模型参数一致,且识别位移曲线和实际测量位移曲线吻合良好,验证了QSSE方法在橡胶隔震支座参数识别中的有效性与准确性,并证明了本文所得Bouc-Wen模型参数的合理性及Bouc-Wen模型简化的可行性。

Parameter Identification of Rubber-Bearings Based on QSSE Method

Parameter identification of nonlinear rubber-bearing isolators is investigated using quadratic sum-squares error(QSSE) method.Classic Bouc-Wen models are established to describe the dynamic character of the rubber-bearings.Further,experimental tests using a particular type of rubber-bearing are conducted.Based on experimental data,QSSE method is used to identify model parameters. The results show that the estimated parameters obtained by QSSE method are identical in different scenarios(i.e.,different excitations and Bouc-Wen models with different amount of parameters).Besides,the identified displacements match the experimental ones well.Research results demonstrate that QSSE method is effective and accurate for parameter identification of nonlinear hysteretic rubberbearings.Bouc-Wen model has the ability to describe the nonlinear behavior of rubber-bearings,and the model simplifying is reasonable.